Navigation Links
Counting the twists in a helical light beam
Date:1/8/2013

Cambridge, Mass. - January 8, 2013 - At a time when communication networks are scrambling for ways to transmit more data over limited bandwidth, a type of twisted light wave is gaining new attention. Called an optical vortex or vortex beam, this complex beam resembles a corkscrew, with waves that rotate as they travel.

Now, applied physicists at the Harvard School of Engineering and Applied Sciences (SEAS) have created a new device that enables a conventional optical detector (which would normally only measure the light's intensity) to pick up on that rotation.

The device, described in the journal Nature Communications, has the potential to add capacity to future optical communications networks.

"Sophisticated optical detectors for vortex beams have been developed before, but they have always been complex, expensive, and bulky," says principal investigator Federico Capasso, Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering.

In contrast, the new device simply adds a metallic pattern to the window of a commercially available, low-cost photodetector. Each pattern is designed to couple with a particular type of incoming vortex beam by matching its orbital angular momentumthe number of twists per wavelength in an optical vortex.

Sensitive to the beam's "twistiness," this new detector can effectively distinguish between different types of vortex beams. Existing communications systems maximize bandwidth by sending many messages simultaneously, each a fraction of a wavelength apart; this is known as wavelength division multiplexing. Vortex beams can add an additional level of multiplexing and therefore should expand the capacity of these systems.

"In recent years, researchers have come to realize that there is a limit to the information transfer rate of about 100 terabits per second per fiber for communication systems that use wavelength divisio
'/>"/>

Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. 2011 ErgoExpo Attendees Choice Award Winners Announced During Sold Out Expo; Exhibitor Renewal for 2012 Hits 96% and Counting
2. Sequenom Announces Appointment of Carolyn Beaver to Chief Accounting Officer
3. NASA develops super-black material that absorbs light across multiple wavelength bands
4. A light wave of innovation to advance solar energy
5. The Foremost Expert on Morgellons Disease Highlights the Gravity of This Illness
6. BioSpace Spotlights Northwests Life Science Community
7. Multidisciplinary team of researchers develop world’s lightest material
8. Blocked holes can enhance rather than stop light going through
9. Novartis Highlights Advances for Patients With Breast Cancer and Hematological Diseases With Over 160 SABCS and ASH Abstracts
10. New 3-D transistors promising future chips, lighter laptops
11. Sheffield scientists shine a light on the detection of bacterial infection
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Counting the twists in a helical light beam
(Date:7/11/2014)... , July 11, 2014 /CNW/ - Sunovion Pharmaceuticals Canada ... TM (eslicarbazepine acetate) for use as a once-daily ... patients with epilepsy who are not satisfactorily controlled with ... use in patients under 18 years of age. ... neurological disorders and according to Epilepsy Canada, it affects ...
(Date:7/10/2014)... Canada (PRWEB) July 10, 2014 ... present in very low abundance and are often ... challenging and time-consuming. , Join presenters Dr. Rowel ... and Dr. John Anders, Head of Quality at ... spectrometer-based approach that can speed detection and quantitation ...
(Date:7/10/2014)... July 10, 2014 Unraveling life’s mysteries ... The Archer Family purchased a DNA test ... but ended up with a lifetime of memories, sharing, ... the family members’ DNA genuinely brought the family closer ... search deeper into genetic history and prior to taking ...
(Date:7/10/2014)... Senior supply chain management executives from over 50 ... of “Reducing Cost, Lead Time, & Defects in the ... the partnership of the Bio Supply Management Alliance ( ... SCMI) of the University of San Diego in ... Institute of Peace and Justice in San Diego, Devendra ...
Breaking Biology Technology:Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 2Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 3Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 4Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 3Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 4Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 5Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4
... -- Researchers at the USDA Forest Service Forest Products ... the pulp and paper industry in an effort to ... paper commonly used in business and government offices ... federal government annually buys some 500,000 tons of bleached ...
... Third Wave Technologies , a developer and marketer of molecular ... patent infringement lawsuit against Stratagene Corp. , a life ... which was passed by a federal jury in the United ... that Stratagene's line of FullVelocity reagents had infringed on two ...
... in reality too, as an ultra-sophisticated, digitally formatted, ... in shapes of large digital cyber-warfare torpedoes skate ... direct hits took over. , ,Now there are ... either corporate elites or very smart solo entrepreneurs; ...
Cached Biology Technology:Reducing brightness to make a better paper 2Reducing brightness to make a better paper 3Third Wave wins patent lawsuit against California firm 2Cyber-skating on one flat earth 2Cyber-skating on one flat earth 3Cyber-skating on one flat earth 4
(Date:7/10/2014)... -- Unisys Corporation,s (NYSE: UIS ) subsidiary in ... that it has been selected by the Dutch Custodial Institutions ... Provision Biometrics solution for penitentiaries across The Netherlands ... a solution based on its open standards-based LEIDA ... is up to seven years, with the new system expected ...
(Date:7/10/2014)... Sweden , July 7, 2014 ... its first major design win (DW). A Chinese Top 5 ... the planned start of mass production in October 2014.   ... a Chinese Top 5 smartphone OEM, which has a planned ... and a target sales volume for this phone of 3 ...
(Date:7/10/2014)... mainly tropical flowering plant family Melastomataceae (Meadow Beauty Family). Most ... bees for their pollination. Only about 100 are known to ... Axinaea appear in clusters of few to more ... are pink, yellow, orange or red. The stamens (male reproductive ... bulbous appendages. The pollination mechanism of Axinaea had ...
Breaking Biology News(10 mins):Unisys Delivers New Basic Provision Biometrics Solution to Dutch Custodial Institutions Service 2Unisys Delivers New Basic Provision Biometrics Solution to Dutch Custodial Institutions Service 3FPC Wins DW for 1021 Touch Sensor for Flagship Smartphone from Chinese Top 5 Smartphone OEM 2Novel type of bird pollination mechanism discovered in South America 2
... has made a new breakthrough, revealing a critical component in ... role in the healing process from bacterial inflammation. "The process ... drugs that are based on the natural processes that take ... drugs that attempt to curb inflammation by artificial means," explains ...
... A multinational study has identified a key gene mutation ... patients of white European ancestry. The study, which originated ... in the HMGA1 gene led to a major drop in ... sensor through which insulin tells the cell to absorb sugar. ...
... This press release is available in German ... long period of time, show changes in their mechanical properties. ... microscopic mechanisms. However, the microscopic structure and the complexity of ... why a team led by Professor Andreas Bausch from the ...
Cached Biology News:How much can a cell uptake? 2How much can a cell uptake? 3Type 2 diabetes linked to single gene mutation in 1 in 10 patients 2
Normal human serum, single donor...
... Beacon Designer designs oligos for SYBR ... beacon, NASBA and FRET assays. Highly specific ... found by automatically interpreting BLAST search results. ... secondary structures identified by connecting to the ...
Agar, 5 lb. Bacteriological.Moisture: < 10%, ash: < 6.5%. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
Request Info...
Biology Products: